225697237 has 2 divisors, whose sum is σ = 225697238. Its totient is φ = 225697236.

The previous prime is 225697207. The next prime is 225697249. The reversal of 225697237 is 732796522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 206956996 + 18740241 = 14386^2 + 4329^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-225697237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 225697193 and 225697202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (225697207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112848618 + 112848619.

It is an arithmetic number, because the mean of its divisors is an integer number (112848619).

Almost surely, 2^225697237 is an apocalyptic number.

It is an amenable number.

225697237 is a deficient number, since it is larger than the sum of its proper divisors (1).

225697237 is an equidigital number, since it uses as much as digits as its factorization.

225697237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 43.

The square root of 225697237 is about 15023.2232560127. The cubic root of 225697237 is about 608.8478089435.

The spelling of 225697237 in words is "two hundred twenty-five million, six hundred ninety-seven thousand, two hundred thirty-seven".